Datasheet N74F776A, N74F776N, N74F776F Datasheet (Philips)

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74F776

Pi-bus transceiver

Product specification
IC15 Data Handbook

1990 Dec 19

INTEGRATED CIRCUITS

Philips Semiconductors Product specification

74F776Pi–bus transceiver

2

December 19, 1990 853 1121 01321

FEA TURES

• Octal latched transceiver

• Drives heavily loaded backplanes with equivalent load impedances

down to 10 ohms

• High drive (100mA) open collector drivers on B port

• Reduced voltage swing (1 volt) produces less noise and reduces

power consumption

• High speed operation enhances performance of backplane buses
and facilitates incident wave switching

• Compatible with Pi–bus and IEEE 896 Futurebus standards

• Built–in precision band–gap reference provides accurate receiver

thresholds and improved noise immunity

• Controlled output ramp and multiple GND pins minimize ground
bounce

• Glitch–free power up/power down operation

• Multiple package options

• Industrial temperature range available (–40°C to +85°C)

DESCRIPTION

The 74F776 is an octal bidirectional latched transceiver and is
intended to provide the electrical interface to a high performance
wired–OR bus. The B port inverting drivers are low–capacitance open
collector with controlled ramp and are designed to sink 100mA from 2
volts. The B port inverting receivers have a 100 mV threshold region
and a 4ns glitch filter.

The 74F776 B port interfaces to ’Backplane Transceiver Logic’ (BTL).
BTL features a reduced (1V to 2V) voltage swing for lower power

consumption and a series diode on the drivers to reduce capacitive
loading. Incident wave switching is employed, therefore BTL
propagation delays are short. Although the voltage swing is less for
BTL, so is its receiver threshold, therefore noise margins are excellent.

BTL offers low power consumption, low ground bounce, EMI and
crosstalk, low capacitive loading, superior noise margin and low
propagation delays. This results in a high bandwidth, reliable
backplane.

The 74F776 A port has TTL 3–state drivers and TTL receivers with a
latch function. A separate high–level control voltage input (V

X

) is
provided to limit the A side output level to a given voltage level (such
as 3.3V). For 5.0V systems, V

X

is simply tied to VCC.

The 74F776 has a designed feature to control the B output transitions
during power sequencing. There are two possible sequencing, They
are as follows:

1.When LE

= low and OEBn = low then the B outputs are disabled until

the LE

circuitry takes control. Then the B outputs will follow the A inputs,

making a maximum of one transition during power–up (or down).

2. If LE = high or OEBn = high then the B outputs will be disabled during
power–up (or down).

TYPE

TYPICAL PROPAGA-

TION DELAY

TYPICAL SUPPL Y

CURRENT( TOTAL)

74F776 6.5ns 80mA

ORDERING INFORMATION

ORDER CODE

COMMERCIAL RANGE INDUSTRIAL RANGE

DESCRIPTION

VCC = 5V ±10%, T

amb

= 0°C to +70°C VCC = 5V ±10%, T

amb

= –40°C to +85°C

PKG DWG #

28–pin plastic DIP (600 mil) N74F776N I74F776N SOT117-2

28–pin PLCC N74F776A I74F776A SOT261-2

INPUT AND OUTPUT LOADING AND FAN OUT TABLE

PINS DESCRIPTION

74F (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

A0 – A7 PNP latched inputs 3.5/0.1 17 70µA/70µA
B0 – B7 Data inputs with threshold circuitry 5.0/0.167 100µA/100µA

OEA A output enable input (active high) 1.0/0.033 20µA/20µA

OEB0, OEB1 B output enable inputs (active low) 1.0/0.033 20µA/20µA

LE Latch enable input (active low) 1.0/0.033 20µA/20µA
A0 – A7 3–state outputs 150/40 3mA/24mA
B0 – B7 Open collector outputs OC/166.7 OC/100mA

Notes to input and output loading and fan out table

One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
OC = Open collector.

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

3

PIN CONFIGURATION

1
2
3
4
5
6
7
8
9

10 19

20

21

22

23

24

25

26

27

28

V

CC

11
12
13
14 15

16

17

18

LE
B0
B1
GND
B2
B3
GND
B4
B5
B6
GND
B7
OEB

1

OEB

0

OEA

A0

GND

A1
A2
A3

GND

A4
A5

GND

A6
A7
VX

SF00422

PIN CONFIGURA TION PLCC

4 3 2 1 28 27

25
24
23
22
21
20

11

10

9

8

7

6

18

16 17151413

26

19

12

5

PLCC

A1
A2
A3

GND

A4
A5

GND

V

CC

OEAA0GND LE B0 B1

GNDOEB0

B7

V

X

A7A6 OEB1

GND
B2
B3
GND
B4
B5
B6

SF00423

IEC/IEEE SYMBOL

2

3

&

EN2

EN1
EN3

ID

27

26
24
23
21
20
19
17

5
6
7
9
10
12
13

3

15
16
28
2

SF00424

LOGIC SYMBOL

VCC = Pin 1, V

X

= Pin 14

GND = Pin 4, 8, 11, 18, 22, 25

15

2
28
16

OEB0
OEA
LE
OEB1

B0 B1 B2 B3 B4 B5 B6 B7

27 26 24 23 21 20 19 17

35679101213

A0 A1 A2 A3 A4 A5 A6 A7

SF00425

PIN DESCRIPTION

SYMBOL PINS TYPE NAME AND FUNCTION

A0 – A7 3, 5, 6, 7, 9, 10, 12, 13 I/O PNP latched input/3–state output (with VX control option)
B0 – B7 27, 26, 24, 23, 21, 20, 19, 17 I/O

Data input with special threshold circuitry to reject noise/ open collector output, high

current drive
OEB0 15 Input Enables the B outputs when both pins are low
OEB1 16 Input

OEA 2 Input Enables the A outputs when high

LE 28 Input Latched when high (a special feature is built in for proper enabling times)
V

X

14 Input Clamping voltage keeping VOH from rising above VX (VX = Vcc for normal use)

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

4

LOGIC DIAGRAM

LE

B0

OEB0

Data

Q

27

3

LE

OEA

V

CC

= Pin 1, V

X

= Pin 14,

GND = Pin 4, 8, 11, 18, 22, 25

A0

LE

B1

Data

Q

26

5

A1

LE

B2

Data

Q

24

6

A2

LE

B3

Data

Q

23

7

A3

LE

B4

Data

Q

21

9

A4

LE

B5

Data

Q

20

10

A5

LE

B6

Data

Q

19

12

A6

LE

B7

Data

Q

17

13

A7

28

2

16

15

OEB

1

SF00426

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

5

FUNCTION TABLE

INPUTS LATCH OUTPUTS OPERATING MODE

An Bn* LE OEA OEB0 OEB1 STATE An Bn

H X L L L L H Z Z A 3–state, data from A to B
L X L L L L L Z L
X X H L L L Qn Z Qn A 3–state, latched data to B
– – L H L L (1) (1) (1) Feedback: A to B, B to A
– H H H L L H (2) H Z(2) Preconditioned latch enabling data transfer from B to A
– L H H L L H (2) L Z(2)
– – H H L L Qn Qn Qn Latch state to A and B
H X L L H X H Z Z
L X L L H X L Z Z B and A 3–state
X X H L H X Qn Z Z
– H L H H X H H Z
– L L H H X L L Z B 3–state, data from B to A
– H H H H X Qn H Z
– L H H H X Qn L Z
H X L L X H H Z Z
L X L L X H L Z Z B and A 3–state
X X H L X H Qn Z Z
– H L H X H H H Z
– L L H X H L L Z B 3–state, data from B to A
– H H H X H Qn H Z
– L H H X H Qn L Z

Notes to function table

H = High voltage level
L = Low voltage level
X = Don’t care
– = Input not externally driven
Z = High impedance ”off” state
Q

n

= High or Low voltage level one setup time prior to the low–to–high LE transition.
(1) = Condition will cause a feedback loop path: A to B and B to A.
(2) = The latch must be preconditioned such that B inputs may assume a high or low level while OEB

0 and OEB1 are low and LE is high.

B* = Precaution should be taken to insure the B inputs do not float. If they do they are equal to low state.

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

6

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)

SYMBOL

PARAMETER RATING UNIT

V

CC

Supply voltage –0.5 to +7.0 V

V

X

Threshold control –0.5 to +7.0 V

V

IN

Input voltage OEBn, OEA, LE –0.5 to +7.0 V

A0 – A7, B0 – B7 –0.5 to +5.5 V

I

IN

Input current –40 to +5 mA

V

OUT

Voltage applied to output in high output state –0.5 to V

CC

V

I

OUT

Current applied to output in low output state A0 – A7 48 mA

B0 – B7 200 mA

T

amb

Operating free air temperature range Commercial range 0 to +70

°C

Industrial range –40 to +85

°C

T

stg

Storage temperature range –65 to +150

°C

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER LIMITS UNIT

MIN NOM MAX

V

CC

Supply voltage 4.5 5.0 5.5 V

V

IH

High–level input voltage Except B0 – B7 2.0 V

B0 – B7 1.6 V

V

IL

Low–level input voltage Except B0 – B7 0.8 V

B0 – B7 1.45 V

I

Ik

Input clamp current Except A0 – A7 –18 mA

A0 – A7 –40 mA

I

OH

High–level output current A0 – A7 –3 mA

I

OL

Low–level output current A0 – A7 24 mA

B0 – B7 100 mA

T

amb

Operating free air temperature
range

Commercial range 0 +70

°C

range

Industrial range –40 +85

°C

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

7

DC ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temperature range unless otherwise noted.)

SYMBOL

PARAMETER TEST LIMITS UNIT

CONDITIONS

1

MIN TYP2MAX

I

OH

High–level output current B0 – B7 VCC = MAX, VIL = MAX, VIH = MIN, VOH = 2.1V 100 µA

I

OFF

Power–off output current B0 – B7 VCC = 0.0V, VIL = MAX, VIH = MIN, VOH = 2.1V 100 µA

VCC = MIN, I

OH

= –3mA, VX =V

CC

2.5 V

CC

V

V

OH

High-level output voltage A0 – A7

4

VIL = MAX, VIH = MIN

I

OH

= –4mA,

VX =3.13V and 3.47V

2.5 V

A0 – A7

4

VCC = MIN, I

OL

= 20mA, VX = V

CC

0.50 V

V

OL

Low-level output voltage B0 – B7 VIL = MAX I

OL

= 100mA 1.15 V

VIH = MIN I

OL

= 4mA 0.40 V

V

IK

Input clamp voltage A0 – A7 VCC = MIN, II = I

IK

-0.5 V

Except A0 – A7 VCC = MIN, II = I

IK

-1.2 V

I

I

Input current at OEBn, OEA, LE VCC = 0.0V, VI = 7.0V 100 µA
maximum input voltage A0 – A7, B0 – B7 VCC = MAX, VI = 5.5V 1 mA

I

IH

High–level input current OEBn, OEA, LE VCC = MAX, VI = 2.7V , Bn –An =0V 20 µA

B0 – B7 VCC = MAX, VI = 2.1V 100 µA

I

IL

Low–level input current OEBn, OEA, LE VCC = MAX, VI = 0.5V –20 µA

B0 – B7 VCC = MAX, VI = 0.3V –100 µA

I

OZH

+ I

IH

Off state output current,
high level voltage applied

A0 – A7 VCC = MAX, V

O

= 2.7V 70

µA

I

OZL

+ I

IL

Off state output current,
low level voltage applied

A0 – A7 VCC = MAX, VO = 0.5V –70

µA

I

X

High–level control current

VCC = MAX, V

X

= VCC, LE = OEA = OEBn =

2.7V, A0 – A7 = 2.7V, B0 – B7 = 2.0V,

–100 100 µA

VCC = MAX, V

X

= 3.13 & 3.47V , LE = OEA =

2.7V, OEBn = A0 – A7 = 2.7V, B0 – B7 = 2.0V,

–10 10 µA

I

OS

Short circuit output
current

3

A0 – A7 only

VCC = MAX, Bn = 1.8V, OEA = 2.0V,
OEBn = 2.7V

-60 -150 mA

I

CCH

VCC = MAX 65 100 mA

I

CC

Supply current (total) I

CCL

VCC = MAX, VIL = 0.5V 100 145 mA

I

CCZ

75 100 mA

Notes to DC electrical characteristics

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
Unless otherwise specified, V

X

= VCC for all test conditions.

2. All typical values are at VCC = 5V, T

amb

= 25°C.

3. Not more than one output should be shorted at a time. For testing I

OS

, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I

OS

tests should be performed last.

4. Due to test equipment limitations, actual test conditions are for V

IH

=1.8v and VIL = 1.3V .

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

8

AC ELECTRICAL CHARACTERISTICS

A PORT LIMITS

T

amb

= +25°C T

amb

= 0°C to

+70

°C

T

amb

= –40°C to +85°C

SYMBOL PARAMETER TEST VCC = +5.0V

VCC = +5.0V ± 10% VCC = +5.0V ± 10%

UNIT

CONDITION CL = 50pF,

RL = 500Ω

CL = 50pF,

RL = 500Ω

CL = 50pF,

RL = 500Ω

MIN TYP MAX MIN MAX MIN MAX

t

PLH

t

PHL

Propagation delay
Bn to An

Waveform 1

5.5

4.5

8.0

6.0

12.0

9.0

5.5

4.5

12.0

9.0

5.5

4.5

12.0

9.0

ns

t

PZH

t

PZL

Output enable time to high
or low, OEA to An

Waveform 3, 4

8.0

8.5

10.5

11.0

13.5

13.5

7.5

8.0

15.0

15.5

7.5

8.0

15.5

15.5

ns

t

PHZ

t

PLZ

Output disable time from
high or low, OEA to An

Waveform 3, 4

2.0

2.0

3.5

4.5

6.0

7.0

1.5

2.0

6.5

7.5

1.5

2.0

6.5

7.5

ns

B PORT LIMITS

TEST

T

amb

= +25°C T

amb

= 0°C to

+70

°C

T

amb

= –40°C to +85°C

SYMBOL PARAMETER CONDITION VCC = +5.0V

VCC = +5.0V ± 10% VCC = +5.0V ± 10%

UNIT

C

D

= 30pF, RU = 9Ω CD = 30pF, RU = 9Ω CD = 30pF, RU = 9Ω

MIN TYP MAX MIN MAX MIN MAX

t

PLH

t

PHL

Propagation delay
An to Bn

Waveform 1

3.0

3.0

5.0

4.5

7.0

7.5

2.5

2.5

8.0

8.5

2.0

2.5

9.0

8.5

ns

t

PLH

t

PHL

Propagation delay
LE to Bn

Waveform 1

3.5

3.5

5.0

5.0

8.0

8.0

3.0

2.5

9.0

9.0

2.5

2.5

9.5

9.5

ns

t

PLH

t

PHL

Enable/disable time
OEB

n to An

Waveform 1

3.0

3.5

4.5

5.5

7.0

9.0

2.5

3.5

8.0

10.0

2.5

3.5

8.5

10.5

ns

t

TLH

t

THL

Transition time, B port

1.3V to 1.7V , 1.7V to 1.3V

Test Circuit and

Waveforms

0.5

0.5

2.0

2.0

4.5

4.5

0.5

0.5

5.0

4.5

0.5

0.5

5.0

4.5

ns

AC SETUP REQUIREMENTS

LIMITS

TEST

T

amb

= +25°C T

amb

= 0°C to +70°C T

amb

= –40°C to +85°C

SYMBOL PARAMETER CONDITION VCC = +5.0V

VCC = +5.0V ± 10% VCC = +5.0V ± 10%

UNIT

CL = 50pF,

RL = 500Ω

CL = 50pF,
RL = 500Ω

CL = 50pF,

RL = 500Ω

MIN TYP MAX MIN MAX MIN MAX

t

su

(H)

t

su

(L)

Setup time, high or low
An to LE

Waveform 2

3.5

4.5

4.5

5.0

4.5

5.0

ns

th(H)
t

h

(L)

Hold time, high or low
An to LE

Waveform 2

0.0

0.0

0.0

0.0

0.0

0.0

ns

t

w

(L) LE pulse width, low Waveform 2 4.0 5.0 5.0 ns

AC WAVEFORMS

V

M

V

M

V

M

V

M

An, Bn

An, Bn, OEB

n

t

PLH

t

PHL

SF00427

Waveform 1. Propagation delay for data to output

LE

V

M

V

M

V

M

V

M

V

M

V

M

tsu(L)

th(L) th(H)

An

V

M

tw(L)

ts(H)

SF00428

Waveform 2. Data setup and hold times and LE pulse width

Philips Semiconductors Product specification

74F776Pi–bus transceiver

December 19, 1990

9

AC WAVEFORMS (Continued)

V

M

V

M

V

M

t

PHZ

t

PZH

VOH -0.3V

0V

OEA

An

SF00429

Waveform 3. 3-state output enable time to high level and output
disable time from high level

V

M

V

M

V

M

t

PLZ

t

PZL

VOL +0.3V

OEA

An

SF00430

Waveform 4. 3-state output enable time to low level and output
disable time from low level

Notes to AC waveforms

For all waveforms, V

M

= 1.5V .

The shaded areas indicate when the input is permitted to change for predictable output performance.

TEST CIRCUIT AND WAVEFORMS

t

w

90%

V

M

10%

90%

V

M

10%

90%

V

M

10%

90%

V

M

10%

NEGATIVE
PULSE

POSITIVE
PULSE

t

w

AMP (V)

low V

low V

t

THL (tf

)

INPUT PULSE REQUIREMENTS

rep. rate

t

w

t

TLHtTHL

1MHz 500ns 2.5ns

2.5ns

Input pulse definition

V

CC

family

A port

D.U.T.

PULSE

GENERATOR

R

L

C

L

R

T

V

IN

V

OUT

Test circuit for 3–State outputs on A port

DEFINITIONS:

R

L

= Load resistor; see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value.
RU= Pull up resistor; see AC electrical characteristics for value.
C

D

= Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value.
RT= Termination resistance should be equal to Z

OUT

of pulse generators.

t

THL (tf

)

t

TLH (tr

)

t

TLH (tr

)

AMP (V)

amplitude

3.0V

1.5V

V

M

R

L

7.0V

V

CC

D.U.T.

PULSE

GENERATOR

C

D

R

T

V

IN

V

OUT

Test circuit for outputs on B port

R

U

7.0V

1MHz 500nsB port 2.0V 1.0V

4.0ns

4.0ns

Low V

0.0V

1.0V

SWITCH POSITION

TEST SWITCH

closed

openAll other

t

PLZ

, t

PZL

SF00431

Philips Semiconductors Product specification

74F776Pi-bus transceiver

1990 Dec 19

10

DIP28: plastic dual in-line package; 28 leads (600 mil); long body SOT117-2

Philips Semiconductors Product specification

74F776Pi-bus transceiver

1990 Dec 19

11

PLCC28: plastic leaded chip carrier; 28 leads SOT261-2

Philips Semiconductors Product specification

74F776Pi-bus transceiver

yyyy mmm dd

12

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one

or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can

reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.

Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone [phone]

 Copyright Philips Electronics North America Corporation 1998

All rights reserved. Printed in U.S.A.

print code Date of release: 10-98
Document order number: 9397-750-05177

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

Data sheet
status

Objective
specification

Preliminary
specification

Product
specification

Product
status

Development

Qualification

Production

Definition

[1]

This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.

This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.

Data sheet status

[1] Please consult the most recently issued datasheet before initiating or completing a design.